What is the best way to calculate the R-value of irregular wall section?

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Alexey Steshenko

The best way to measure this value is in field tests using a heat flux density meter and temperature. so you get a valid value

Aryan Shahabian

I agree with both previous answers. If you have access to a real 1:1 model of the wall system and lab accessories then follow Alexey's suggestion. Otherwise, if you have only computer models then Jesús's suggestion would be the best possible option.